/Engine/Source/Runtime/MovieScene/Public/Evaluation/MovieSceneEvaluationKey.h
Keyable struct that represents a particular entity within an evaluation template (either a section/template or a track)
struct FMovieSceneEvaluationKey
uint32
SectionIndex
Indexof the section template within the track this key relates to (or -1 where this key relates to a track)
FMovieSceneSequ...
SequenceID
ID of the sequence that the entity is contained within
FMovieSceneTrac...
TrackIdentifier
ID of the track this key relates to